Sharpening and grinding tool.



B. G. HAWKINS. SHARPENING AND GRINDING TOOL.

APPLICATION FILED JULY 7.1909.

Patented Mar. 1, 1910.

anvanfoz IIIWIE inn.

SHABPE'NING AND GRINDING TOOL.

Specification of Letters Patent.

Patented lttlar. it, 1910).

Application filed July *7, 1909. Serial No. 506,267.

To all whom it may concern:

Be it known that I, EDWARD C. HAWKINS, a citizen of the United States,residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inSharpeningand Grinding Tools, of which the following is a specification.

This invention relates to sharpening and grinding tools, and moreparticularly to a 1 tool adapted to be used by dentists for sharp eningand grinding polishing wheels, as used for grinding the teeth.

The primary object of the invention is to provide a simple andinexpensive tool with one or more sharpening or grinding elements, whichare detachably and adjustably held by the tool for engaging a polishingor grinding wheel.

Another object of this invention is to provide a tool that can beconveniently used by a dentist for cleansing and removing foreign matterfrom the periphery of a polishing or grinding wheel.

The above and other objects are attained by a tool comprising a suitablehandle provided with a rest and an adjustable truing device. The rest isdesigned to steady the polishing or grinding wheel relative to thetruing tool, this being accomplished while the grinding wheel is beingrevolved by an ordinary treadle machine or motor through the medium of aflexible shaft,this machine being common in the practice of dentists.

My invention will be hereinafter considered in detail and then claimed,and reference will now be had to the drawing forming a part of thisspecification wherein there is illustrated a preferred embodiment of theinvention, but it is to be understood that the structural elementsthereof can be varied or changed as to the size, shape and manner ofassemblage without departing from the spirit of the invention. I

In the drawings: Figure 1 is an elevation of the tool holder of atreadle machine, Fig. 2 is a side elevation of my improved sharpeningand grinding tool, Fig. 3 is a plan of the same, and Fig. 4L is anenlarged longitudinal sectional view of the adjustable sharp enerholder.

In the drawings, 1 denotes a handle having the reduced end thereofprovided with a ferrule 2 to prevent the handle from splitting, and inthe reduced end of said handle is mounted a tool rest and a. sharpenerholder. The tool rest comprises an arm 3 off set as at l, with the endthereof bent to form a hook 5. The sharpener holder comprises ahorizontal arm 6 having the end thereof bent upwardly into parallelismwith the arm 3 and threaded, as at 7. The arms 3 and 6 can be made ofone piece of strong and durable wire or of a rod bent upon itself,whereby the bent end will fit in the reduced end of the handle 1.

8 denotes a jam nut screwed upon the threaded end of the arm 6, and 9denotes a conical shaped or eXteriorly threaded sleeve, which isinteriorly threaded to receive the threaded end of the arm 6. The loweror large end of the sleeve 9 is provided with an integral nut 10 wherebythe sleeve can be easily rotated upon the threaded end of the arm 6, andadapted to screw upon the conical shaped sleeve 9 is a lock nut 11. Thislock nut is knurled, as at 12, whereby said nut can be easily rotated.The outer or smaller end of the conical sleeve 9 is split and providedwith. confronting gripping faces 13 to receive a plurality of sharpeners14. These sharpeners are preferably made of spring metal and one or morecan be used, according to the nature of the work to be performed by saidtruing device. The lock nut 11 is adapted to hold the sharpeners 14 inthe conical shaped sleeve 9, said sleeve serving functionally as achuck. After the sleeve 9 has been adjusted upon the threaded end 7 ofthe arm 6, the jam nut 8 is adjusted to hold said sleeve in position. Itwill thus be observed that the Sharpeners 14 can be adjusted relative tothe hook 5 of the arm 3, and the manner of using the tool is as fol lowsWith the sharpening tool gripped in one hand and the tool holder 15 of atreadle machine in the other hand, the spindle l6 detachably mounted inthe holder 15 is placed in the hook 5, and the grinding wheel 17 of saidspindle thrown into engagement with the sharpeners 14. These sharpenersare of a suflicient width to grind a flat surface upon the polishingwheel 17, or the periphery of the grinding wheel can be shaped accordingto the manner in which the wheel is presented to the sharpeners.

The arm 3 comprising the rest facilitates an operator in properlyholding the grinding wheel in engagement with the sharpeners, thereby itwould be an extremely difficult matter to properly hold the grindingwheel, since the rapidity at which the Wheel is revolved would have atendency to cause the same to glance from the sharpeners. It would thusbe almost impossible to evenly cleanse or grind the grinding wheel.

Having now described my invention what I claim as new, is:

1. A tool of the type described comprising a handle, arms carried bysaid handle, one of said arms being bent to provide an off-set hookadapted to steady a tool holder having a reduced grinding Wheel, aconical shaped split sleeve adjustably mounted upon the other of saidarms, a plurality of sharpeners arranged in the split end of the sleeveand adapted to engage the grinding wheel of the tool holder held inengagement with the other of said arms, a nut screwed upon said conicalsleeve for locking said sharpeners therein, and a jam nut screwed uponthe arm to hold said adjustable sleeve in a fixed position.

2. In a tool of the type described, the combination of a handle, a pairof arms carried by the handle, a sharpener mounted upon one of the arms,and means upon the opposite arm for engaging the spindle of a rotatabletool for holding the tool accurately in engagement with the sharpener.

3. In a tool of the type described, the combination of a handle, a pairof arms carried by the handle, a split sleeve adjustably mounted uponone of the arms, a sharpener fitted within the said split sleeve, aclamping nut threaded upon the split sleeve for locking the sharpener inposition therein, and means upon the opposite arm for engaging thespindle of a rotatable tool for holding the tool accurately inengagement with the sharpener.

l. In a tool of the type described, the combination of a handle, a pairof arms carried by the handle, a split sleeve threaded upon one of thearms, a jam nut for locking the split sleeve in position, a sharpenerreceived within the said split sleeve, a clamping nut threaded upon thesplit sleeve for clamping the sharpener securely in position therein,and means upon the opposite arm for engaging the spindle of a rotatingtool for r holding the tool accurately in engagement with the sharpener.

In a tool of the type described, the combination of a handle, a pair ofparallel arms carried by the handle, a split sleeve adj 11stablythreaded upon one of the arms, means for locking the said split sleevein position, a sharpener received within the split sleeve, a clampingnut threaded upon the split sleeve for clamping the sharpener securelyin position therein, and a hook upon the opposite parallel. arm forengaging the spindle of a rotatable tool for holding the tool aecuratelyin engagement with the sharpener.

In testimony whereof I, atiix my signature in presence of two witnesses.

EDIVARD C. HAIVKINS.

.Vitnesses H. IV. KELLY, M. BAYAN.

